rivers_countries = {'ChangJiang River': 'China',
                    'Mississippi River': 'America',
                    'Rhine River': 'Germany'}
for river, country in rivers_countries.items():
    print('The ' + river + ' runs through ' + country + '.')
for river in rivers_countries.keys():
    print(river)
for country in rivers_countries.values():
    print(country)
